Fix outdated package name regex pattern in documentation (#11523)

doc/04-schema.md

@@ -35,7 +35,7 @@ separated by `/`. Examples:
 * igorw/event-source
 
 The name must be lowercase and consist of words separated by `-`, `.` or `_`.
-The complete name should match `^[a-z0-9]([_.-]?[a-z0-9]+)*/[a-z0-9](([_.]?|-{0,2})[a-z0-9]+)*$`.
+The complete name should match `^[a-z0-9]([_.-]?[a-z0-9]+)*/[a-z0-9](([_.]|-{1,2})?[a-z0-9]+)*$`.
 
 The `name` property is required for published packages (libraries).